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            "questionId": "584",
            "questionFrontendId": "584",
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            "title": "Find Customer Referee",
            "titleSlug": "find-customer-referee",
            "content": "<p>Table: <code>Customer</code></p>\n\n<pre>\n+-------------+---------+\n| Column Name | Type    |\n+-------------+---------+\n| id          | int     |\n| name        | varchar |\n| referee_id  | int     |\n+-------------+---------+\nid is the primary key column for this table.\nEach row of this table indicates the id of a customer, their name, and the id of the customer who referred them.\n</pre>\n\n<p>&nbsp;</p>\n\n<p>Write an SQL query to report the IDs of the customer that are <strong>not referred by</strong> the customer with <code>id = 2</code>.</p>\n\n<p>Return the result table in <strong>any order</strong>.</p>\n\n<p>The query result format is in the following example.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> \nCustomer table:\n+----+------+------------+\n| id | name | referee_id |\n+----+------+------------+\n| 1  | Will | null       |\n| 2  | Jane | null       |\n| 3  | Alex | 2          |\n| 4  | Bill | null       |\n| 5  | Zack | 1          |\n| 6  | Mark | 2          |\n+----+------+------------+\n<strong>Output:</strong> \n+------+\n| name |\n+------+\n| Will |\n| Jane |\n| Bill |\n| Zack |\n+------+\n</pre>\n",
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            "difficulty": "Easy",
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            "exampleTestcases": "{\"headers\":{\"Customer\":[\"id\",\"name\",\"referee_id\"]},\"rows\":{\"Customer\":[[1,\"Will\",null],[2,\"Jane\",null],[3,\"Alex\",2],[4,\"Bill\",null],[5,\"Zack\",1],[6,\"Mark\",2]]}}",
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                {
                    "lang": "MySQL",
                    "langSlug": "mysql",
                    "code": "# Write your MySQL query statement below\n",
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                },
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                    "lang": "MS SQL Server",
                    "langSlug": "mssql",
                    "code": "/* Write your T-SQL query statement below */\n",
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                    "lang": "Oracle",
                    "langSlug": "oraclesql",
                    "code": "/* Write your PL/SQL query statement below */\n",
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            "hints": [
                "Be careful of the NULL value"
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            "status": null,
            "sampleTestCase": "{\"headers\":{\"Customer\":[\"id\",\"name\",\"referee_id\"]},\"rows\":{\"Customer\":[[1,\"Will\",null],[2,\"Jane\",null],[3,\"Alex\",2],[4,\"Bill\",null],[5,\"Zack\",1],[6,\"Mark\",2]]}}",
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            "mysqlSchemas": [
                "Create table If Not Exists Customer (id int, name varchar(25), referee_id int)",
                "Truncate table Customer",
                "insert into Customer (id, name, referee_id) values ('1', 'Will', 'None')",
                "insert into Customer (id, name, referee_id) values ('2', 'Jane', 'None')",
                "insert into Customer (id, name, referee_id) values ('3', 'Alex', '2')",
                "insert into Customer (id, name, referee_id) values ('4', 'Bill', 'None')",
                "insert into Customer (id, name, referee_id) values ('5', 'Zack', '1')",
                "insert into Customer (id, name, referee_id) values ('6', 'Mark', '2')"
            ],
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